Musk quickly doubled down on the maybe-joke, replying to his tweet by calling Tesla’s forthcoming fashion offerings “S3XY” and “unis3x” and suggesting that they be teamed with “thigh-high sock boots.”

The 47-year-old billionaire’s sudden interest in short shorts appears to have been sparked by his ongoing war against Tesla’s short sellers, who have been betting for years that his car company will fail.

Earlier this month, Musk tweeted his plan to send Greenlight Capital hedge funder (and Tesla short-seller) David Einhorn a box of shorts as a consolation prize for Tesla’s rising stock.

“I want to thank @elonmusk for the shorts. He is a man of his word!” Einhorn tweeted. “They did come with some manufacturing defects,” he added, in an apparent jab at the production problems and bad press that have plagued Tesla lately.